docs: def get_build_info_for_date(self, date, build_index=None):
          """Return the build information for a given date."""
          url = urljoin(self.base_url, self.monthly_build_list_regex)
          has_time = date and date.time()
  
          self.logger.info('Retrieving list of builds from %s' % url)
          parser = self._create_directory_parser(url)
          regex = r'%(DATE)s-(\d+-)+%(BRANCH)s%(L10N)s%(PLATFORM)s$' % {
              'DATE': date.strftime('%Y-%m-%d'),
              'BRANCH': self.branch,
              # ensure to select the correct subfolder for localized builds
              'L10N': '(-l10n)?' if self.locale_build else '',
              'PLATFORM': '' if self.application not in (
                          'fennec') else '-' + self.platform
          }
  
          parser.entries = parser.filter(regex)
          parser.entries = parser.filter(self.is_build_dir)
  
          if has_time:
              # If a time is included in the date, use it to determine the
              # build's index
              regex = r'.*%s.*' % date.strftime('%H-%M-%S')
              parser.entries = parser.filter(regex)
  
          if not parser.entries:
              date_format = '%Y-%m-%d-%H-%M-%S' if has_time else '%Y-%m-%d'
              message = 'Folder for builds on %s has not been found' % \
                  self.date.strftime(date_format)
              raise errors.NotFoundError(message, url)
  
          # If no index has been given, set it to the last build of the day.
          self.show_matching_builds(parser.entries)
          # If no index has been given, set it to the last build of the day.
          if build_index is None:
              # Find the most recent non-empty entry.
              build_index = len(parser.entries)
              for build in reversed(parser.entries):
                  build_index -= 1
                  if not build_index or self.is_build_dir(build):
                      break
          self.logger.info('Selected build: %s' % parser.entries[build_index])
  
          return (parser.entries, build_index)